Covariates		n	Physical Component Summary	P	Mental Component Summary	P
Age, years
	17-22	93	49.7 ± 7.1	0.154	42.1 ± 11.1	0.895
	23-33	87	51.2 ± 6.6		41.8 ± 12.3
Sex
	F	105	49.5 ± 7.2	0.031	40.7 ± 11.6	0.089
	M	75	51.7 ± 6.2		43.7 ± 11.5
FIES
	No	87	51.8 ± 6.6	0.010	43.8 ± 11.7	0.037
	Yes	93	49.2 ± 7.0		40.2 ± 11.4
Sleepiness
	No	87	51.8 ± 6.6	0.007	43.1 ± 11.9	0.194
	Yes	93	49.1 ± 7.0		40.9 ± 11.4
Headache
	No	84	52.3 ± 6.1	0.014	44.1 ± 10.7	0.001
	Yes	96	48.8 ± 7.2		40.1 ± 12.2
Physical activity
	No	73	49.6 ± 7.1	0.163	39.5 ± 12.1	0.018
	Yes	107	51.0 ± 9.7		43.6 ± 11.1
Rented house
	No	142	50.5 ± 7.1	0.691	42.5 ± 11.8	0.251
	Yes	38	50.1 ± 6.2		40.0 ± 10.8
Live with family
	No	48	50.8 ± 5.8	0.668	40.3 ± 11.4	0.264
	Yes	132	50.3 ± 7.3		42.5 ± 11.7
Have a housemaid
	No	74	49.8 ± 6.5	0.318	41.2 ± 11.6	0.444
	Yes	106	50.9 ± 7.2		42.5 ± 11.7
Have a car
	No	59	51.1 ± 7.4	0.398	40.0 ± 11.4	0.118
	Yes	121	50.1 ± 6.6		42.1 ± 1.79

Int J Med Educ. 2015; 6:149-154; doi: 10.5116/ijme.563a.5dec